Effect of chitosan dissolved in different acetic acid concentration towards VOC sensing performance of quartz crystal microbalance overlay with chitosan

Improvement in sensing layer properties of quartz crystal microbalance (QCM) sensors are crucial developing gas with high sensitivity and selectivity. In this work, we study the use chitosan thin film as on a QCM sensor to identify presence volatile organic compounds specifically isopropyl alcohol (IPA). The effect dissolved different acetic acid concentrations towards overlay performance were studied. Characterization work at (1.0, 1.5, 2.0, 2.5% (v/v)) performed by using FTIR FESEM. Higher concentration led higher degree protonation which results more progressive solubilization promotes smoother film. For 2% acid, highest resonance frequency shift (99.3 Hz) was observed during adsorption analyte molecules sensors. This can be explained increase solubility protonation. indicates that difference dissolution affects gas.